缝洞型三重介质油藏分形渗流规律

发布时间：2018-03-22 08:07

本文选题：缝洞型油藏　切入点：分形　出处：《新疆石油地质》2017年02期 　论文类型：期刊论文

【摘要】：缝洞型三重介质油藏非均质性强,孔隙结构复杂,为比较精确描述复杂系统,引入分形理论,建立分形三重介质缝洞型油藏数学模型。通过Laplace变换及Stehfest数值反演的方法,求出井底压力解;借助matlab编程绘制压力动态曲线,划分渗流阶段,分析渗流特征,进行分形参数敏感性分析;结合钻测井数据,解释渗流参数,验证模型的正确性。结果表明:分形三重介质缝洞型油藏渗流过程分为早期井筒储集,溶洞系统向裂缝系统窜流,溶洞与裂缝系统拟径向流,基质与溶洞、裂缝系统窜流,总体径向流5个渗流阶段。分形系数影响整个渗流过程,随着分形系数的增大,裂缝迂曲度增大,致使渗流阻力增加,引起压力导数曲线整体上移幅度增大,总径向流阶段上翘幅度也增大。
[Abstract]:In order to describe the complex system accurately, fractal theory is introduced to establish the mathematical model of fracture-cavity reservoir in fracture-cavity triplet reservoir. By means of Laplace transform and Stehfest numerical inversion, the mathematical model of fracture-cavity reservoir is established by means of Laplace transform and Stehfest numerical inversion. The bottom hole pressure solution is obtained, the dynamic pressure curve is drawn by matlab programming, the percolation stage is divided, the percolation characteristic is analyzed, the fractal parameter sensitivity analysis is carried out, and the percolation parameter is interpreted with drilling log data. The results show that the seepage process of fracture-cavity reservoir is divided into early wellbore reservoir, cavern system channeling to fracture system, cavern and fracture system quasi-radial flow, matrix and cavern, fracture system channeling. The fractal coefficient affects the whole seepage process. With the increase of fractal coefficient, the degree of fracture detour increases, which leads to the increase of seepage resistance and the increase of the whole upward range of the pressure derivative curve. The upwarping amplitude also increases in the total radial flow stage.
【作者单位】：中国石油大学石油工程教育部重点实验室;
【基金】：国家科技重大专项(2016ZX05014003004)
【分类号】：TE312;P618.13

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